DC blocking apparatus and technique for sampled data filters

Details DC blocking apparatus and technique for sampled data filters DC blocking apparatus and technique for sampled data filters

1996-07-12

1997-12-16

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

By integrating

327554, 327552, 327345, 330 9, 330107, 333173, H03K 500, H03F 304

Patent

active

056990065

ABSTRACT:
A sampled data filter (400) provides on-chip blocking of DC signals. The addition of a very long time constant (VLTC) integrator (412) into the negative feedback path (414) of a first sampled data integrator (402) provides a lower corner frequency (502) with a zero at DC. The lower corner frequency (502) is adjustable while the desired frequency response is maintained.

REFERENCES:
patent: 4996529 (1991-02-01), Connell
patent: 5182522 (1993-01-01), Tanigawa et al.
patent: 5389839 (1995-02-01), Heck
A Parasitic-Insensitive Area-Efficient Approach to Realizing Very Large Time Constants in Switched-Capacitor Circuits, K. Nagaraj, IEEE Transactions on Circuits and Systems, vol. 36, No. 9, Sep. 1989.
Khorramadadi, H. and Gray, P.R., "High-Frequency CMOS Continuous-time Filters," IEEE Solid State Circuits, vol. SC-19, No. 6, pp. 939-948, Dec. 1984.
Allstot,D.J., Brodersen, R.W. and Gray, P.R., "MOS Switched Capacitor Ladder Filters," IEEE Solid State Circuits, vol. SC-13, pp. 806-814, Dec. 1978.

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